JPH07257877A - Tower jib crane - Google Patents

Abstract

PURPOSE: To reduce assembly and maintenance cost of a tower type jib crane. CONSTITUTION: At the upper end of the rotatable portion 1' of a crane column 1, a jib mounting part 1" is fitted. A jib 3 is mounted on the jib mounting part 1" so as to rotate around a horizontal axis 4 through fork structures 3', 3" in its rear end. Hydraulic cylinder units 5, 5' are disposed for supporting the jib 3 and lifting up and down. One end of each cylinder unit is fitted to the jib 3, and the other end is fitted to the rotatable portion 1'. A unit 6 is disposed between the fork structures 3', 3" of the jib at the rear end of the jib 3, and the whole hydraulic station is stored in its internal space. The unit 6 is connected to the partition wall 3''' of the jib 3 with three bolts 9, 10, 11 at its front portion.

Description

Detailed Description of the Invention

[0001]

OBJECTS OF THE INVENTION The present invention comprises a tower jib crane, and more particularly, a primarily box-shaped jib, the jib being mounted at its rear end to a rotatable portion of the crane column for pivotal movement about a horizontal axis. Further, one end is attached to the jib at a position separated from the rear end of the jib, and the other end is attached to a rotatable part at a position separated downward from the installation position of the jib on the rotatable part of the crane prop. Tower jib crane equipped with a hydraulic cylinder.

Conventional tower-type jib cranes (eg DE-O)
By disposing a hydraulic drive station (Hydraulik station) in the jib, the one described in S3411051) enables free passage to the crane cockpit through the crane support. However, even with this configuration, as for hydraulically driven stations, as with station placement in crane stanchions, it is cumbersome to assemble and pipe the individual components in a confined space, and thus maintenance is difficult. It has the drawback of being difficult. Due to limited assembly possibilities,
The time required for assembly is naturally longer than in the case of a single, independent unit, which can be mounted as a complete unit.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to improve the conventional tower jib crane to overcome the above mentioned drawbacks and to reduce the assembly and maintenance costs as much as possible.

[0004]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention comprises a jib formed mainly in a box shape, the jib being rotatable at its rear end around a horizontal axis in a rotatable part of a crane column. And one end of which is attached to the jib at a position away from the rear end of the jib, and the other end of which is rotatable at a position apart from the jib attachment position in the rotatable part of the crane prop below the jib. In a tower jib crane with a hydraulic cylinder attached to the jib, the jib has a bifurcated structure at its rear end, and the entire hydraulic drive station of the crane is an independent unit, with a bifurcated crossbeam at the rear end of the jib. And a tower type jib crane characterized by being arranged between.

By having the hydraulic drive station as an independent unit, it is possible to assemble the entire unit in a transportation ramen in a factory. Also,
It will be possible to test the unit before mounting it on the crane. Furthermore, after the unit is manufactured, it is possible to provide a protective coating on the outside thereof against wind and rain.

[0006] The only work required to attach the independent unit to the crane is to tie the unit to the jib, make hose and pipe connections to the motor and cylinder, and make electrical connections. When using a separate ramen for the hydraulic drive station unit,
The unit may be secured to the jib with three bolt connections. This facilitates attachment of the unit to the jib and prevents twisting of the jib from being transmitted to the unit.

If the hydraulic drive station is combined with the winch to form an expanded unit, assembly and maintenance are further facilitated. As a result, the subsequent installation work on the crane is eliminated and the operational safety of the system is increased. It is possible to place single or multiple winches in the unit.

Furthermore, the modular construction according to the invention provides operational advantages during the manufacture of the crane. This is because this clearly separates the work areas for steel / machine manufacturing from the work areas for hydraulic technology, which allows for geographically separated manufacturing, eg license production with rapid delivery. Is.

The unit is very easily maintained and repaired on the crane. The heavy components of the unit can easily be repaired if necessary with the help of a crane. The entire unit can be replaced if necessary. From these, it is possible to significantly reduce the wasted time when the crane is not in operation.

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In all the drawings, the same components are given the same numbers. In FIG. 1, the main part of the crane column 1 is partially shown.
A rotatable part 1'of the crane column is coaxially attached to the crane column 1, and a crane cockpit 2 is provided at the side of the rotatable part 1'and a jib attachment portion 1'at the upper end. 'Is provided. The crane jib 3 is formed in this embodiment, for example, as a box-shaped support arm, and at its rear end, through the bifurcated structure 3 ′, 3 ″ of the box-shaped support arm, the jib attachment 1 ′ of the rotatable part 1 ′. It is mounted rotatably around a horizontal axis 4.

Two hydraulic cylinder units 5, 5'are used to support and raise and lower the jib 3. Each of the hydraulic cylinder units has one end attached to the jib 3 at a position away from the rear end of the jib 3 and the other end rotatable at a position apart from the jib attachment portion 1 ″ of the rotatable portion 1 ′ below. It is attached to part 1 '.

A rectangular parallelepiped unit 6 is arranged at the rear end of the jib 3 between the bifurcated structures 3 ', 3''of the jib, the interior space of which is used to house the entire hydraulic drive station. To be done. The unit 6 is also used as a holder for the lift winch 7 as well as another winch 7'in this embodiment. The unit 6 is connected at its front part to the partition wall 3 '''of the jib 3 by means of three bolts 9, 10, 11.

[Brief description of drawings]

1 is a side view showing the top of a tower jib crane with a jib and unit according to the present invention. FIG.

FIG. 2 is a plan view showing the rear region of a tower jib crane equipped with a unit according to the invention.

[Explanation of symbols]

 1 Crane support 1'Rotable part 1 '' Jib mounting part 2 Crane cockpit 3 Jib 3 ', 3' 'Bifurcated structure 5, 5' Hydraulic cylinder unit 6 Unit 7, 7 'Winch 9, 10, 11 Bolt

Claims (3)

[Claims] 1. A jib formed mainly in a box shape,
The jib is rotatably mounted at its rear end to a rotatable part of a crane strut about a horizontal axis, and further has one end mounted to the jib at a position remote from the rear end of the jib and the other end. In a tower jib crane with a hydraulic cylinder attached to the rotatable part at a position spaced downward from the jib attachment position in the rotatable part of the crane strut, wherein the jib 3 is bifurcated at its rear end. With the structure 3 ', 3'', the entire hydraulic drive station of the crane
A tower type jib crane, characterized in that it is arranged as an independent unit 6 between the cross girders of the bifurcated structures 3 ', 3''at the rear end of the jib 3. 2. The hydraulic drive station 6 is united with a single winch 7 or a plurality of winches 7, 7'to form an extended, independent unit. Tower type jib crane described in. 3. The tower jib crane according to claim 1 or 2, wherein the hydraulic drive station 6 is fixed to the jib 3 by three bolts 9, 10, 11.